Stone-crusher



O. G. BUCHANAN. Stone OruSher..

No. 231,530. Patented Aug. 24, I880.

fl 1 fl WITNESSES: I 1 VENTOR: W/Qmzm I %J MMW/ BY 7 4. L fig MPEI'ERS,PHOTO-UYHDGRAF'HER, WASHINGTON. D C.

PATENT Gar-ion.

CHARLES Gr. BUCHANAN, OF BROQKLYN, NEW YORK.

.STO'N E- C R US HIER.

SPECIFICATION forming part of Letters Patent No. 231,530, dated August24, 1880.

Application filed December 12, 1879.

To all whom it may concern:

Be itknown that I, CHARLES G. BUCHANAN, of Brooklyn, in the county ofKings and State of New York, have invented a new and ImprovedStone-Crusher, of which the following is a specification.

Figure 1 is a sectional longitudinal elevation of crusher on line mm,Fig. 2. Fig. 2 is aplan. Fig. 3 is a transverse section of a portion ofthe crusher on line 1 3 Fig. 1.

Similar letters indicate like parts.

The object of this invention is to produce a parallel and sliding motionupon the lower portion of the crushing-plates for the purpose ofincreasing the pressure, and, if desired, reducing the product to agreater degree of fineness.

The invention consists in the combination of fixed or rigid links withtwo vertical jaws, said jaws pivoted and arranged in such manner that bythe application of the link they are made to move together with arelative sliding and parallel motion.

In the drawings, A represents the frame of the machine B, the crankshaft provided with suitable journals, 0 0. Motion is imparted to thejaw-lever D by means of the pitman E.

F F are the two jaws secured to the frame by the shafts G G. The shaft Gis fixed, but the shaft G is adjustable by means of the movable boxes Hin the frame working in a slide and adjusted by the wedges I, which arein turn secured by set screws K, passing through the lugs m. By means ofthese wedges and boxes the jaws F F may be adjusted to crush orpulverize to any required size. The jaws F F are provided with removablecrushin g jaws or plates L L, that are held in position by the beveledkeys a. They are provided with corrugations extending horizontallyacross their faces, and so arranged that the projection in one fits intoa corresponding cavity in the other. The bottoms of these plates areprovided with a plane or nearly smooth surface, arranged in such amanner that when the jaws stand in a vertical position the said straightportion of the plate will be at right angles to a line drawn through thecenter of the shafts that support the jaws.

The links 0 connect the two jaws and transmit the motion from the jaw Fto F. It is evident that if the links are secured to the jaws at pointson the same horizontal plane, and at equal distances from a line drawnbetween the jaws when they stand in a relative vertical position, themotion imparted to the jaws from the crank-shaft will produce a slidingparallel motion on the lower portion of the crushing-plates. There is aslight disturbing element that would prevent a perfect parallelmotionthat is, the action of the jaw has a tendency to throw the linkout of its horizontal position; but the motion of the jaw is so slightand the amount of variation so small that it would be impossible tomeasure it even in thelargest-sized machine a slightinequality of workwould affect the truth of the motion more than the action of the links,so that in practice it can be disregarded entirely.

I am aware that a sliding rubbing motion has been used before, and I donot claim it as a new feature.

The application of rods to the jaws of crushers is not new; but I claimthat the use of the links for the purpose specified is original.

Side rods or links have been used, but only in connection with a crankor eccentric, as in the Fowler and Wagner crusher and others. The linksor rods are used in these crushers for the purpose of causing the jawsto advance and recede from each other, thus producing a positivecrushing motion, while the links in my invention are to prevent themfrom ap proaching and to keep the jaws at afixed distance apart. Linkshave also been used to strengthen the machine and have been applied asbraces or tension-rods.

It is well known that the tensile strength of minerals is only aboutone-tenth of its resistance to compression.

By the action of the jaws of this crusher the mineral is subjected to atorsional and shearing strain, thus aflilying the power in such a mannerthat the mineral offers the least possible resistance to fracture. Bythe use of this motion one machine is capable of doing every class ofwork-such as crushing stone for macadamized roads, &c., or forpulverizing ores.

Having thus described my invention, I lower supporting-pivots of saidjaws, when the claim as new and desire to secure by Letters faces ofsaid jaws are equidistant from a ver- Patent-- tical line projectedupward from the central In a stone-crusher, as a means for holding pointbetween said supporting-pivots, as set 5 the crushing-jaws always atnearly the same forth.

distance apart, and at the same time causing CHAS. G. BUCHANAN. them tomove in the samedirection when in 0p eration, the rigid links 0 O,pivoted to the up- \Vituesses:

per ends of saidjaws parallel with a horizontal I. I. STORER,

10 line drawn between and centrally through the (J. SEDGWICK.

